[PSUBS-MAILIST] Titan submersible missing at Titanic site

Tue Jun 27 17:50:59 EDT 2023

This is the sort of BS I'm talking about. I know it'll die down eventually,
but this is PAINFUL (someone listed a 'submersible controller' on eBay). ~
Doug

https://www.ebay.com/itm/166188209542?hash=item26b196d586:g:zi4AAOSwhxJklQ1D&amdata=enc%3AAQAIAAAA4EcRsYtJc3qYkpxbkNoKcopgiR1P6jRS68SW%2Fa%2FvePMWBC1CsRVK8oty6UAtcr87P8Ze4h1TK2CCjVl%2Bd81cbJGMRGrLBVhvIrQ4mCkjPt4EuFaT81WxpSZNqrHg%2BQXzeVYHh7vLFjXjirZHuYMbyyPJxXfko0IfVNZsxJgqilNJJjRF43nGVJiH3OQ%2FS0j9a1RSuAOQo0%2BdMNUvdrySWx23IxsvZd7bOMjG7PQOCAjmzwJlMS4FCOGF2zywjBlYLcVADyWY1F2FWnMRLp1KpYHRZpX%2FHKNpWXvSem8wtuXp%7Ctkp%3ABk9SR5jPm-2fYg

On Tue, Jun 27, 2023 at 3:46 AM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> No strait or of truck and into form is best, less chance of segregation
> Hank
>
> Sent from my iPhone
>
> On Jun 26, 2023, at 9:12 PM, Marc de Piolenc via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 
>
> Soooo. Stratification. Sounds like a good argument for using pumps if
> you're using premix.
>
> Marc
> On 6/26/2023 9:33 PM, hank pronk via Personal_Submersibles wrote:
>
> Hi Mark,
> We do not find air pockets, in most cases the concrete is vibrated.  I
> think the issue is aggregate segregation.  Before concrete pumps, long
> chutes  witch will allow the aggregate to separate from the mix.  This
> common with those mixer trucks that mix on the spot also.
> Hank
>
> On Monday, June 26, 2023, 04:52:54 AM MDT, Marc de Piolenc via
> Personal_Submersibles <personal_submersibles at psubs.org>
> <personal_submersibles at psubs.org> wrote:
>
>
> When you encounter an easy-to-cut section of concrete, do you find a void
> there (air bubble) or a place where the concrete exists, but has stratified
> of been allowed to dry before setting?
>
> Marc de Piolenc
> On 6/26/2023 12:16 AM, hank pronk via Personal_Submersibles wrote:
>
> Alec. The Swiss sub was concrete with a slip form method.  I think Farrow
> cement is troweled onto a mesh frame.  I was pretty intrigued by this also.
> A conversation with Sean made me change my mind.  Although concrete
> structures under water have a good track record, the chance of a weak spot
> is too great.  My business includes concrete cutting, and often when
> cutting we hit spots that cut much easier within the same pour.
> Hank
>
>
> Sent from my iPhone
>
> On Jun 25, 2023, at 9:08 AM, Alec Smyth via Personal_Submersibles
> <personal_submersibles at psubs.org> <personal_submersibles at psubs.org> wrote:
>
> 
> There's an interesting story about cement subs, which I will tell to the
> best of my recollection. In the early years we had a PSUBS member whose
> name I forget, I believe Swiss or Austrian, who had built a ferrocement sub
> that he kept at a mooring in a Swiss lake. The sub was successful, he dived
> it for years. But eventually he moved to Colombia due to marriage, and
> scuttled the sub in the lake, because the road he had used to take it there
> had been re-routed or modified somehow, leaving him without any way of
> getting it out. The sub became an attraction for local SCUBA divers.
>
> The second part of the story is that another PSUBS member, Ian Roxborough,
> hired the first guy to build him a large cement sub with the intention of
> making it an ocean going live-aboard. The project was done completely on
> the level, with notification to authorities and in a major port. This was
> no drug sub built in the jungle. It got to the point where the hull was
> complete, and I think they were about for the first launch. However,
> Colombia being plagued by drug subs, the authorities would not sign off on
> final paperwork or something (can't remember the exact glitch.) Ian had
> sunk a ton of funds into it, and the sub was probably perfectly good, but
> approval never came. I'm not sure what happened to the sub. But Ian is
> still very much active, so maybe can tell us. I'm not sure if he's on the
> email list. If you are, Ian, sorry for bringing up this rather painful
> memory!
>
> Best,
> Alec
>
> On Sun, Jun 25, 2023 at 8:35 AM Marc de Piolenc via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> That's it. I lost interest when I realized he had built a superstructure
> on a conventional pressure hull.
>
> Very sorry  to hear about Brian Cox.
>
> Marc
> On 6/25/2023 6:11 PM, Jon Wallace via Personal_Submersibles wrote:
>
> Marc, that was probably Brian Cox who passed away a year or so ago.  His
> pressure hull was steel but he did use ferrocement for the superstructure.
> http://www.subdb.info/cgi/database/showvessel/index.cgi?ID=1272980224&VN=Esmae&VT=1
>
> There are no standards for using ferrocement as a manned submarine
> pressure hull and I think anyone attempting it would find little support
> for the project given the Ocean Gate loss.
>
> Jon
>
>
> On Sunday, June 25, 2023 at 04:09:00 AM EDT, Marc de Piolenc via
> Personal_Submersibles <personal_submersibles at psubs.org>
> <personal_submersibles at psubs.org> wrote:
>
>
> I know. I fell in love with FC for yachts, which made me wonder how
> useful it would be for pressure hulls... Turns out there is a 2010
> exchange of messages in my archive with somebody on this list who built
> in FC, Brian Cox. Is he still there?
>
> Marc
>
> On 6/24/2023 8:27 PM, Bernie Hellstrom via Personal_Submersibles wrote:
> > Many boat hulls were made with FC. Even the landing barges in the ww2 ,
> to make piers to in load ships!
> >
> > Sent from my iPhone
> >
>
>
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